Best national ideas for Serbia?

[Jet Bug]

I am playing as serbia and I am still new to this game so someone could give me a heads up regarding this matter that would be exellent. For first idea I took trade since that is my only income since Serbia has low base tax, and for second I took defancive ideas to impove my armys moral (since I am constantly struggling with the upkeep for the army I did not took quality ideas since I am already having a hard time maintaining a steady income)
P.S
Thank you in advance and I apologise for any tiping/grammar errors.
And have a fun time playing this awsome game !

[Thoraxe41]

I think In my playthrough I went

Aristocratic- Good for the Core increase, Cav Bonus and Tech Discount
Diplomatic- This one was situational to my needs, though never a bad choice
Defensive-Morale helps later on against the Ottomans
Offensive-Combo of Force Limits and better Generals
Trade-Money
Quality-For Aweome Cavalry

Funny looking at this I took no adm whatsoever

[Jet Bug]

Thanks alot mate, otomans are beaten tho cos I play online with a frend and he plays as Byzantium so we kinda managed to conqure them 50%